① Possible reasons for a shallow screen include: short circuit caused by dirty PCB board; The zebra paper itself is short circuited, and the zebra paper electrode is pressed at the screen
Short circuit; Electrode misalignment during pressing or screen pressing.
② Possible reasons for display disorder include: broken testing fixtures; The PCB chip is damaged; The pressure plate and screen are severely misaligned, zebra
Short circuit between paper and PCB board; Zebra about short circuit.
③ Possible reasons for missing COM or SEG include: PCB board open circuit; Breaking the zebra paper electrode during pressing or screen pressing, zebra paper
The electrode itself is broken; Cut off the electrode or the electrode of the screen itself when clearing the screen; The zebra paper joint cracked.
④ Possible reasons for displaying 'none' include: broken testing fixtures; The power supply voltage is abnormal; Clamp the tooling properly during testing; PCB board is damaged;
The zebra paper joint is severely cracked.
⑤ Possible reasons for not following the program include: problems with the testing fixture, power supply, and testing clip; The PCB board is damaged.
(3) General steps for fault diagnosis:
① Check if the power is properly connected, if the power is turned on and off, and if the voltage and current readings on the meter are normal; The test voltage is
Is it correct.
② Check if the testing fixture is functioning properly, if the wiring from the fixture to the power supply is correct, and if the plug connecting the testing clip to the fixture is correct
Check if the mouth is correct and if the test clip is securely clamped (in good contact).
③ Inspect the lamination of zebra paper under a microscope to see if there are any cracks, misalignment, or breakage
Check if the screen or board is clean.
④ During the test, use the black pin of the multimeter to contact the positive terminal of the module, and the red pin to measure the corresponding electrodes on the PCB board (especially the reason)
Check if the output of the obstacle is normal to determine if the PCB board is in good condition.
⑤ Use a multimeter to check if there is a short circuit at the electrode where the fault exists.
